JPH0531014B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to an endless belt for power transmission, particularly a belt for a continuously variable transmission that is used by being wound around a primary and secondary pulley consisting of a pair of sheaves. relates to a chain-type belt formed by connecting a large number of links in an endless manner.

(b) Conventional technology Conventionally, this type of chain belt consists of a large number of links, pins, and V-blocks, and the belts are connected endlessly by fitting pins into pin holes with a circular cross section drilled at both ends of the links. In addition, both sides of the link are 1
It is constructed by connecting V blocks formed in a V shape so as to be in contact with a pair of sheaves (Japanese Patent Application Laid-Open No.
(See Publication No. 57-22442).

In addition, a chain-type belt was devised in which a pair of connecting pin members that could swing into contact with each other were fitted into a single pin hole instead of using cylindrical pins.
(See Japanese Patent Publication No. 14807, Japanese Patent Publication No. 52-35833, and Japanese Patent Publication No. 58-3136).

(C) Problems to be Solved by the Invention By the way, in the above-mentioned conventional belts, whether the belt uses a cylindrical pin or a pair of connecting pin members, the link and the pin member are separate bodies. Therefore, it is necessary to drill a hole in the link into which the pin member is inserted.

Therefore, the pitch P of a chain type belt is determined by the radius a of the pin hole and the link end length b required for strength.
(P>a+b),
It is not possible to reduce the pitch P. Therefore,
The conventional belt generates a large polygonal effect, resulting in undesirable phenomena such as transmission speed pulsation, belt vibration and noise generation.

A chain type belt has also been proposed in which pins and/or pin holes are integrally formed in the V block to shorten the pitch (Japanese Patent Laid-Open Publication No. 12147/1983).

However, this belt consists of a single member, a V-block member that receives compressive force from the pulleys and transfers power between the belt and the pulleys using frictional force, and a link member that receives tensile force and transmits power. As a result, the structure becomes extremely complicated, and complex forces act on the V-block integral member equipped with pins, etc.
Furthermore, these V-block integrated members have a structure that makes them extremely easy to come off in the lateral direction, and the V-block integrated members may come off while the belt is running, causing the belt to disassemble.
There is a risk of a major accident occurring, and since the V-block integral member cannot be constructed in multiple layers, there is a risk of problems with power transmission and durability.

Therefore, the present invention has a structure in which links and V-blocks are configured separately, and the links can be connected in multiple ways, resulting in a structure that is superior in strength, compact, and lightweight, while significantly shortening the pitch. It is an object of the present invention to provide an endless belt for power transmission which eliminates the above-mentioned problems.

(d) Means for solving the problem The present invention has been made in view of the above circumstances, and as shown in FIGS. 1 and 2, protrusions are provided at both ends of the link perpendicular to the plane of the link. 1, 1, and a second link 3 made of an annular member, and the protrusion 1 of the first link 2 is connected to the second link 2.
A link row 6 consisting of a plurality of rows of links is configured by connecting alternately so as to engage with the holes 5 of the links 3, and both outermost rows of links (third links 7) of the link row 6 are further connected. Lock the V block 9 in a pinching manner.
It is characterized by being configured by being attached.

(e) Effect Based on the above-mentioned configuration, the sheave of the primary pulley pinches the V-block 9, so that power is transmitted from the pulley to the V-block 9, and furthermore, by the engagement between the V-block and both outermost links 7, Power is transmitted from the V-block 9 to the outermost link. Then, force is distributed and transmitted from the link to the plurality of rows of first links 2 and second links 3 through the engagement between the protrusion 1 and the hole 5, and further through the tensile force acting on each link. Power is transmitted through the link row 6. In the secondary pulley portion, power is transmitted from both outermost links 7 to the V-block 9, and further, based on the frictional force, power is transmitted from the V-block 9 to the secondary pulley.

(F) Embodiments Hereinafter, embodiments in which the endless transmission belt according to the present invention is used in a continuously variable transmission will be described with reference to the drawings.

(F-1) First Embodiment First, a first embodiment according to the present invention will be described based on FIGS. 1 to 5.

The continuously variable transmission belt B consists of a series of link rows 6
and a large number of V-blocks 9, and the link row 6 consists of two types, the first link 2 and the second link 3, and a third link 7, which is a modified version of the first link 2, is arranged in the outermost row. Become. The first link 2, as shown in FIG. The cylindrical outer surface is arranged to match the outer surface of the link body 2a, and the protrusion length l of the protrusion 1 is approximately the same as or greater than the plate thickness t of the first link body 2a. It is made slightly shorter. Further, as shown in FIG. 5, the second link 3 is made of an annular member, both side surfaces 3b, 3b of which are made of flat surfaces, and an oblong hole 5 is formed in the center portion. The circular arc surfaces 5a, 5a at both ends of the hole 5 have approximately the same radius as the protrusion 1 of the first link. Furthermore, the plate thickness T ₁ of the second link 3 is the same as that of the first link 2.
Therefore, even if the protrusion 1 of the first link 2 engages with the hole 5 of the second link 3 from both sides, the protrusion 1 will not interfere with each other. do not have. Further, the third link 7 has a protrusion 1 integrally formed on one side, similar to the first link 2, and a bulge 10 is formed on the other side at both end portions. A recess 11 for engaging a V block is formed in the center of the bulge 10.

The V-block 9 also includes a V-block piece 12 made of a metal piece with a predetermined thickness and a thin plate-like locking piece 13.
Consisting of The V block piece 12 has a concave groove 15 for receiving the link row 6, and has tapered surfaces 16, 1 at the bottom of both sides thereof to align with the pulley.
6 is formed, and furthermore, locking notches 17, 17 are formed at the upper portions of both sides. Further, the locking piece 13 is made of a plate spring material, and both ends thereof are bent, and locking claws 19, 19 are formed at the tips of the bent portions.

To assemble the belt B for a continuously variable transmission, as shown in FIG. 3, first, one of the third links ₇₁ in the outermost row is arranged sideways in an endless manner. Further, the second links 3 1 of the first row are arranged on the third links 7 ₁ so that the protrusions 1 fit into the arcuate portions 5 a at both ends of the holes 5 of the second links ₃ . Further, the protrusion 1 of the first link 2 is inserted into the hole 5 on the second link 3 ₁ of the first row.
1st link 2 in the 1st row
₁ , and similarly the second link 3 ₂ in the second column,
..., the first links 2 ₂ of the second row are arranged in sequence alternately,
Then, the second link 3n of the nth column is arranged on the first link 2n of the nth column, and finally the second link 3n of the nth column
The protrusion 1 of the other outermost third link ₇₂ is engaged with the hole 5 of the link 3n.
The links 7 ₂ are arranged, thereby forming a plurality of link rows 6.

Then, the V block piece 12 is inserted from the inner diameter side of the endless link row 6 so as to fit or press fit into the groove 11 of the outermost side links 7 ₁ , 7 ₂ . With the multiple link row 6 completely inserted inside, the locking piece 13 is covered from the outer diameter side, and the locking claw 19 of the locking piece 13 is locked in the notch 17 of the block piece 12. , V-block 9 is attached, and the multiple link row 2 is prevented from disassembling into pieces. This completes the assembly of the continuously variable transmission belt B.

The continuously variable transmission belt B is used by being wound between the primary pulley and the secondary pulley, and the sheave of the pulley strongly pinches the V-block 9. Power is transmitted between the pulley and the V-block 9 due to the frictional force, and further, as the block piece 12 comes into contact with the bulge 10 of the outermost link 7, power is transmitted to the link row 6. Furthermore, the projections 1 of the links 7, 2 are connected to the hole arcuate surfaces 5a, 5 of the second link 3 adjacent thereto.
Based on joining a, each link 2, 3,
Force is distributed to links 7, and power is transmitted based on the tensile force acting on each link 2, 3, and 7.
At this time, each link is freely bent due to the connection between the protrusion 1 and the hole arc surface 5a, and the belt B can freely change its curvature according to the effective diameter of the pulley. Further, the belt-squeezing force (axial force) acting on the V-block 9 from the pulley is received by the V-block 9 and at the same time is also borne by the link row 6 into which the V-block 9 is fitted. Furthermore, the force (transmitted torque) in the belt running direction acting on the V-block 9 from the pulley is transmitted to the third link 7 by the block piece 12 on the side surface of the recessed part 11 spanning the full width of the link. Power is reliably transmitted and the V-block 9 is prevented from tilting.

In addition, in the above-mentioned embodiment, in order to ensure engagement with the V block 9 on the outermost row link, a special third link is provided.
Although the link 7 was used, the protrusion 1 of the first link 2,
1, the V block 9 may be installed between the links 1 and 1, and therefore the third link 7 is not necessarily required.

(F-2) Second Embodiment Next, a second embodiment in which the V block of the first embodiment is partially modified will be described based on FIGS. 6 and 7.

The V-block 9' according to this embodiment similarly consists of a V-block piece 12' and a locking piece 13', but compared to the part 9'a that fits into the recess 11 of the third link 7, the part 9' is located on the outside, that is, on the pulley. Contact portion 9'b
is composed of a wide range of

As a result, the belt B ₂ according to this embodiment is
The contact surface between the V block 9' and the pulley increases,
In addition to improving the transmission efficiency, the engagement between the V block 9' and the third link 7 is further ensured, and even if a large moment acts on the V block 9', the V
It is possible to reliably prevent the block 9' from tilting with respect to the link row 6, thereby achieving stable power transmission.

(F-3) Third Example Next, based on FIG. 8 and FIG. 9, the above-mentioned second example
A third embodiment, which is a further modification of the embodiment, will be described.

The continuously variable transmission belt _B3 according to this embodiment is as follows:
In the belt _B2 of the second embodiment, another second V block 20 is also installed between the V blocks 9'. That is, the second V block 20 has V
It consists of a block piece 21 and a locking piece 22, and the V
Although the block piece 21 has the same outer dimensions as the block piece 12' of the V block 9',
The width of the groove 25 that receives the link row 6 is made larger by the height of the bulge 10 of the link 7. After assembling the link row 6 and the V-block 9', that is, in the state of the belt _B2 of the second embodiment, the block piece 21 of the second V-block 20 is inserted between the V-blocks 9' and locked. Piece 22
It can be assembled by locking and fixing.

As a result, the contact area of the belt _B2 with the sheave of the pulley is significantly increased, reducing slippage and increasing transmitted torque.
Furthermore, since the V-blocks 9' and 20 are arranged in close contact with each other, the transmitted power is not only a tensile force acting on the link row 6 but also a pushing force acting directly on each block 9' and 20. It can also be shared by pressure, and the transmission force can be dramatically increased, and the blocks 9' and 20 are prevented from tilting, so that the power can be transmitted reliably and smoothly.

(F-4) Fourth Embodiment Next, another embodiment of the present invention will be described based on FIG.

The belt B ₄ according to this embodiment also includes the first link 2,
It consists of a second link 3 and a third link 7. As shown in a, the first link 2 has protrusions 1 on both end and side surfaces thereof, the outer circumferential surface 1'a of which is an arcuate surface, and the inner circumferential surface 1'b of which is a rolling surface 1'b. 1' and 1' are integrally formed, and the rolling surface 1'b has a curved surface a' at the upper part (on the outer diameter side) and a substantially straight surface b at the lower part. Also,
As shown in b, the second link 3 has a substantially rectangular hole 5', and both ends of the hole 5' are formed by rolling surfaces 5'a. The upper part (outer diameter side) of the surface 5'a consists of a curved surface c expanding outward to the left and right, and the lower part (inner diameter side) consists of a substantially linear surface d. Further, as shown in c and d, the third link 7 has protrusions 1', 1' similar to those of the first link 2 formed on one side, and a recess for engaging the V block on the other side. 11 and bulge 10
is formed.

Then, as shown in e, the protrusions 1', 1' of the two adjacent first links 2, 2 fit into the hole 5' of the second link 3, as described in the first embodiment. Thus, an endless link row is constructed, and the V block is fitted and fixed into the recess 11 of the third link 7, thereby constructing the V belt _B4 . At this time, the rolling surface 1'b of the first link protrusion 1 is joined to the rolling surface 5'a of the second link hole 5' and connected to each other.

As a result, the bending of the first link 2 (the same applies to the third link 7) and the second link 3 is performed by rolling contact between the two rolling surfaces 1'b and 5'a, and the friction caused by the bending Loss can be reduced and transmission efficiency can be improved.

Further, the upper portions of both rolling surfaces 1'b and 5'a are both formed of curved surfaces a and c, so that when the belt bends when it is wound around the pulley, it can be bent smoothly and largely in accordance with the pulley diameter. However, the lower part consists of approximately straight surfaces b and d, and the straight part that is not wrapped around the pulley, that is, the belt
In the part where a large tensile force is acting on B ₄ ,
The large contact area formed by the substantially straight surfaces b and d receives the above-mentioned tensile force, increasing the transmitted torque and improving durability.

(F-5) Other Examples In the above-mentioned example, the length of the first link 2 and the second link 3 are made the same, and the belt is constructed with the same pitch, but the length of the second link 3 The first
It may be configured to be shorter than link 1 and may be configured to vary the pitch.

As a result, the frequency at which the belt B enters and contacts the pulley can be changed, and the pulsation period of the polygonal effect can be changed to disperse the frequency of noise and vibration, thereby further reducing the noise and vibration. can.

(G) Effects of the Invention As explained above, according to the present invention, the first link 2 has the protrusions 1 and 1' formed integrally with the link body 2a, so there is no need for pin holes that were conventionally required. This improves the strength of the link itself, and
The link end dimension can be reduced, and the second link 3 is made of an annular member having one hole 5, 5'.
The pitch can be shortened without reducing strength, and as a result, the pitch can be significantly shortened compared to conventional chain belts, reducing the negative effects of polygonal effects and ensuring smooth power transmission. becomes possible.

Furthermore, since the link row 6 and the V-blocks 9, 9' are constructed separately, the structure is extremely simple, the forces acting on each member are simplified, and the durability is greatly improved. Although it is possible to change the number of multiplication columns of link column 6 arbitrarily,
It can be easily adapted to the required transmission power. Furthermore, the link row 6 is held so as not to be disassembled by locking and mounting the V-blocks 9 and 9', so the V-blocks not only transmit power to the pulleys but also serve the function of holding the link row 6. Although it does not require a special link row holding means, it is safe because it can reliably prevent the links 2 and 3 from coming off laterally or vertically during operation and disassembling the link row. Further, since the V-blocks 9, 9' are fitted into the link row 6, the belt-squeezing force (axial force) acting from the pulleys can be borne not only by the V-blocks but also by the link row 6. Therefore, due to these factors, it is possible to obtain a transmission V-endless belt B that is robust, does not disassemble or break, has excellent durability, and has excellent transmission performance.

Furthermore, the first link 2 and the second link 3, and further V
Blocks 9 and 9' all have a simple structure,
The endless transmission belt B can be made smaller and lighter.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a first embodiment of the present invention, FIG. 2 is a partially sectional front view, and FIG. 3 is a second embodiment.
4 is a diagram showing the first link, a is a front view, b is a plan view, c is a side view, and FIG. 5 is a diagram showing the second link, a
is a front view, b is a plan view, and c is a side view. 6th
The figure is a partially sectional front view showing a second embodiment which is a partial modification of the first embodiment, and FIG. 7 is a sectional view according to FIG. 6. FIG. 8 is a partially sectional front view showing the third embodiment, which is a partial modification of the second embodiment;
The figure is a sectional view taken along the line of FIG. FIG. 10 shows another embodiment of the present invention, in which a is a front view showing the first link, b is a front view showing the second link, c is a plan view showing the third link,
d is a front view thereof, and e is a front view showing an engaged state of the first link and the second link. 1, 1'...protrusion, 1'b...rolling surface, 2...
...First link, 3...Second link, 5,5'...
hole, 5'a... rolling surface, 6... link row,
7...Outermost row link (third link), 9,9'...
V block, 11... recess, 12, 12'... V
Block piece, 13, 13'... Locking piece, 20...
V block, B, B ₂ , B ₃ , B ₄ ... Endless transmission belt, a, c ... curved surface, b, d ... substantially straight surface.

Claims (1)

[Scope of Claims] 1. An endless power transmission belt comprising a link row consisting of a large number of links and a V-block fixed to the link row, wherein the links protrude from both ends of the links perpendicularly to the plane of the links. a first link integrally formed with a protrusion, and a second link made of an annular member; An endless power transmission belt comprising a link row consisting of a row of links, and V-blocks secured and attached to sandwich both outermost links of the link row. 2. The endless belt for power transmission according to claim 1, wherein the outermost row of links has a concave portion for engaging a V block on its outer surface. 3. The endless belt for power transmission according to claim 2, wherein a portion of the V block that contacts the pulley is configured to be wider than a portion of the V block that fits into the V block engagement recess. 4. Claims 1 to 3, in which another V block is inserted between the V blocks that are locked and attached to the link row, and the V blocks are successively arranged in close contact with each other. The endless belt for power transmission according to any one of the items. 5. The protrusion of the first link and the hole of the second link each have a rolling surface, and these rolling surfaces are connected to each other so as to be in contact with each other. Endless belt for power transmission. 6. The endless transmission belt according to claim 5, wherein the inner diameter side of the rolling surface of the first link protrusion and the second link hole is a substantially straight surface. 7. The endless transmission belt according to claim 1, wherein the first link and the second link are configured to have different pitches.